高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (2): 334.

• 研究论文 • 上一篇    下一篇

液晶聚芳醚酮的结构与性能研究

张善举1, 富露祥1, 杨德才1, 孙辉2, 王贵宾2, 吴忠文2   

  1. 1. 中国科学院长春应用化学研究所, 高分子物理与化学国家重点实验室, 长春 130022;
    2. 国家特种工程塑料研究开发中心, 吉林大学化学系, 长春 130023
  • 收稿日期:2000-04-29 出版日期:2001-02-24 发布日期:2001-02-24
  • 通讯作者: 杨德才(1940年出生),男,研究员,主要从事凝聚态高分子研究.
  • 基金资助:

    国家自然科学基金(批准号:29974032);国家科技部基础性研究重大项目(批准号:G12)资助

Studies on the Structure and Properties of Thermotropic Liquid Crystalline Poly(aryl ether ketone)s

ZHANG Shan-Ju1, FU Lu-Xiang1, YANG De-Cai1, SUN Hui2, WANG Gui-Bin2, WU Zhong-Wen2   

  1. 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry Academia Sinica, Changchun 130022, China;
    2. National R&D Center for Super Engineering Plastics, Department of Chemistry, Jilin University, Changchun 130023, China
  • Received:2000-04-29 Online:2001-02-24 Published:2001-02-24

PDF (PC)

被引次数

9

摘要： 以联苯二酚、取代对苯二酚及含氟酮单体为原料,通过亲核取代反应,合成了系列具有液晶性的新型聚芳醚酮.研究了聚合物分子结构与性能之间的关系.由于结晶相是从有序的液晶相转化形成的,故侧基含量的增加对液晶聚合物的融熔转变温度无显著影响.聚合物的液晶稳定性受侧基影响较大,含极性侧基的氯取代聚合物的液晶温区比含大空阻侧基的聚合物的液晶温区小得多,说明空间几何因素比极性因素对液晶稳定性的影响大.不同分子量聚合物有不同的液晶有序结构,低分子量聚合物具有高有序液晶结构,而高分子量聚合物只有低有序的向列相结构.

关键词: 聚芳醚酮, 液晶聚合物, 结构与性能

Abstract: Series of thermotropic liquid crystalline poly(aryl ether ketone)s were synthesized by mucleophilic substitution reactions of 4,4'-biphenol and substituted hydroquinone with different difluoromonomers. The relationship between structure and properties of the novel copolymers was investigated. For the copolymers with liquid crystalline properties, their melting transition temperatures show no great change with increase the content of the crystal-disrupting unit. The reason is that the crystal phase is directly transformed from the ordered liquid crystal phase. Side-groups have important effect on mesophase stability. The temperature range of mesophase stability for the chloro-polymers is smaller than those of other series of copolymers(p-phenyl,t-butyl, methoxy, 3-trifluoromethylbenzene). This behavior indicates that the effect of geometric repulsive factor on the thermodynamic stability of the mesophase is much larger than that of the polarizability attractive factor. Different ordered liquid crystal phases are observed in the polymers with different molecular weights. At low molecular weight, highly ordered smectic liquid crystal phases form. With increasing the molecular weight, the ordered degree of the liquid crystals decreases, and only the nematic liquid crystal phase is observed in the polymer with higher molecular weight.

Key words: Poly(aryl ether ketone)s, Liquid crystalline polymers, Structure and properties

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